added Report.slug field
separated general ORM query filtering from report_to_list into Report.get_query
fixed average aggregation
optimization tweaks
forgot testing comment
added DisplayField.total for displaying report totals
implemented logic for displaying report totals
fixed report totals - increment from 0
fixed totals on properties
fixed report totals on Booleans - they are Numbers
moved sorting into post-query logic
made property filters not required to be display fields
moved preview logic into post-query processing; added search tip when adding property filters
added slug field to report edit forms; gave add view url a name
Merge branch 'master' of https://github.com/SacNaturalFoods/django-report-builder

Conflicts:
	report_builder/models.py
	report_builder/views.py

Did not merge views.report_to_list function until it can work with
m2m